On 03/02/2016 14:32, T i m wrote:
On Wed, 3 Feb 2016 13:00:54 +0000, dennis@home

Tomtoms would probably have noticed if someone has parked a lorry for
five minutes and caused a 30 second delay.

How though? I know there are traffic monitoring cameras on some main
routs (typically on motorways etc) but how would anyone know a lorry
was caught up down some side street used as a rat run?

In the case of the google devices, they use the data from all the other
devices that are in the area, and compare them to historical records for
the section of road. Its one of those cases where the more users there
are in an area the better the modelling gets.

In fact if you go into your "timeline" on google maps (you need to tick
the box to say you agree to it collecting data etc), then it does a
(hard to decide on which side of creepy) trick of recording your
movements and showing them as a combination of itinerary and plotted on
a map, all nicely tied up to a calendar. So you can see exactly where
and when the phone went *anywhere* in the past. It even spots the
buildings you were in most times, sometimes with a question like "were
you in name of business/place?", so it learns the places you go and no
doubt updates its database with the "corrections" people make so that
there accuracy improves with time. (its quite nifty when you want to
check how long you were at a certain place or how long it took etc). If
often use it for cross checking invoices, to make sure I have not forgot
to record any site visits to clients ;-)


--
Cheers,

John.

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